I've read Everblue, the first book in the series quite a long time ago and remembered really enjoying it. I finally decided to buy Evergreen for my Kindle and I picked it up last month because I was on holiday and I only had one physical book with me that I finished in the train before arriving (yay me! I thought I would buy books there but had no time to do shopping)
In the end, I was quite disappointed by this book. I think the thing I really liked about Everblue was Natatoria, the mermaid's world, but most of this book takes place on earth and not in the ocean so it was a disappointment for me. I also really did no like Ash, I've just re-read my review of the first book where I said I liked her... (but it was in 2015 so I've changed a lot since then).
Anyway, it was not bad but I could not stay focused and was easily distracted. The characters were a bit annoying and I was not a huge fan of the Manichaeism, it was way too pronounced in my opinion.
I still recommend this book to younger reader because I think it could work better for them!